1 /*
2 * Copyright (c) 2012-2015 Etnaviv Project
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sub license,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the
12 * next paragraph) shall be included in all copies or substantial portions
13 * of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 *
23 * Authors:
24 * Wladimir J. van der Laan <[email protected]>
25 */
26
27 #include "etnaviv_zsa.h"
28
29 #include "etnaviv_context.h"
30 #include "etnaviv_screen.h"
31 #include "etnaviv_translate.h"
32 #include "util/half_float.h"
33 #include "util/u_memory.h"
34
35 void *
etna_zsa_state_create(struct pipe_context * pctx,const struct pipe_depth_stencil_alpha_state * so)36 etna_zsa_state_create(struct pipe_context *pctx,
37 const struct pipe_depth_stencil_alpha_state *so)
38 {
39 struct etna_context *ctx = etna_context(pctx);
40 struct etna_screen *screen = ctx->screen;
41 struct etna_zsa_state *cs = CALLOC_STRUCT(etna_zsa_state);
42
43 if (!cs)
44 return NULL;
45
46 cs->base = *so;
47
48 cs->z_test_enabled = so->depth_enabled && so->depth_func != PIPE_FUNC_ALWAYS;
49 cs->z_write_enabled = so->depth_writemask;
50
51 /* XXX does stencil[0] / stencil[1] order depend on rs->front_ccw? */
52
53 /* Set operations to KEEP if write mask is 0.
54 * When we don't do this, the depth buffer is written for the entire primitive
55 * instead of just where the stencil condition holds (GC600 rev 0x0019, without
56 * feature CORRECT_STENCIL).
57 * Not sure if this is a hardware bug or just a strange edge case. */
58 #if 0 /* TODO: It looks like a hardware bug */
59 for(int i=0; i<2; ++i)
60 {
61 if(so->stencil[i].writemask == 0)
62 {
63 so->stencil[i].fail_op = so->stencil[i].zfail_op = so->stencil[i].zpass_op = PIPE_STENCIL_OP_KEEP;
64 }
65 }
66 #endif
67
68 /* Determine whether to enable early z reject. Don't enable it when any of
69 * the stencil-modifying functions is used. */
70 if (so->stencil[0].enabled) {
71 if (so->stencil[0].func != PIPE_FUNC_ALWAYS ||
72 (so->stencil[1].enabled && so->stencil[1].func != PIPE_FUNC_ALWAYS))
73 cs->stencil_enabled = 1;
74
75 if (so->stencil[0].fail_op != PIPE_STENCIL_OP_KEEP ||
76 so->stencil[0].zfail_op != PIPE_STENCIL_OP_KEEP ||
77 so->stencil[0].zpass_op != PIPE_STENCIL_OP_KEEP) {
78 cs->stencil_enabled = 1;
79 cs->stencil_modified = 1;
80 } else if (so->stencil[1].enabled) {
81 if (so->stencil[1].fail_op != PIPE_STENCIL_OP_KEEP ||
82 so->stencil[1].zfail_op != PIPE_STENCIL_OP_KEEP ||
83 so->stencil[1].zpass_op != PIPE_STENCIL_OP_KEEP) {
84 cs->stencil_enabled = 1;
85 cs->stencil_modified = 1;
86 }
87 }
88 }
89
90 /* calculate extra_reference value */
91 uint32_t extra_reference = 0;
92
93 if (VIV_FEATURE(screen, ETNA_FEATURE_HALF_FLOAT))
94 extra_reference = _mesa_float_to_half(SATURATE(so->alpha_ref_value));
95
96 cs->PE_STENCIL_CONFIG_EXT =
97 VIVS_PE_STENCIL_CONFIG_EXT_EXTRA_ALPHA_REF(extra_reference);
98
99 cs->PE_ALPHA_OP =
100 COND(so->alpha_enabled, VIVS_PE_ALPHA_OP_ALPHA_TEST) |
101 VIVS_PE_ALPHA_OP_ALPHA_FUNC(so->alpha_func) |
102 VIVS_PE_ALPHA_OP_ALPHA_REF(float_to_ubyte(so->alpha_ref_value));
103
104 for (unsigned i = 0; i < 2; i++) {
105 const struct pipe_stencil_state *stencil_front = (so->stencil[1].enabled && so->stencil[1].valuemask) ? &so->stencil[i] : &so->stencil[0];
106 const struct pipe_stencil_state *stencil_back = (so->stencil[1].enabled && so->stencil[1].valuemask) ? &so->stencil[!i] : &so->stencil[0];
107 cs->PE_STENCIL_OP[i] =
108 VIVS_PE_STENCIL_OP_FUNC_FRONT(stencil_front->func) |
109 VIVS_PE_STENCIL_OP_FUNC_BACK(stencil_back->func) |
110 VIVS_PE_STENCIL_OP_FAIL_FRONT(translate_stencil_op(stencil_front->fail_op)) |
111 VIVS_PE_STENCIL_OP_FAIL_BACK(translate_stencil_op(stencil_back->fail_op)) |
112 VIVS_PE_STENCIL_OP_DEPTH_FAIL_FRONT(translate_stencil_op(stencil_front->zfail_op)) |
113 VIVS_PE_STENCIL_OP_DEPTH_FAIL_BACK(translate_stencil_op(stencil_back->zfail_op)) |
114 VIVS_PE_STENCIL_OP_PASS_FRONT(translate_stencil_op(stencil_front->zpass_op)) |
115 VIVS_PE_STENCIL_OP_PASS_BACK(translate_stencil_op(stencil_back->zpass_op));
116 cs->PE_STENCIL_CONFIG[i] =
117 translate_stencil_mode(so->stencil[0].enabled, so->stencil[0].enabled) |
118 VIVS_PE_STENCIL_CONFIG_MASK_FRONT(stencil_front->valuemask) |
119 VIVS_PE_STENCIL_CONFIG_WRITE_MASK_FRONT(stencil_front->writemask);
120 cs->PE_STENCIL_CONFIG_EXT2[i] =
121 VIVS_PE_STENCIL_CONFIG_EXT2_MASK_BACK(stencil_back->valuemask) |
122 VIVS_PE_STENCIL_CONFIG_EXT2_WRITE_MASK_BACK(stencil_back->writemask);
123 }
124
125 /* XXX does alpha/stencil test affect PE_COLOR_FORMAT_OVERWRITE? */
126 return cs;
127 }
128